发现这些切换技术虽然各有特色，但都没有考虑到移动节点在乒乓移动模式下的切换性能。
Finding those handover technologies have its advantage but they do not satisfied the performance in Ping-pong movement.
youdao
世界杯乒乓球功能四种模式。
World Cup Table Tennis features four modes.
应用推荐
模块上移
模块下移
不移动